Re: Decreasing seams in scaled windows

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I was working with your prior patch yesterday and have updated to the new p=
atch. I have two patches and the first modifies the Qt widget method genera=
tion to add *F() variants of methods that take or return pixel values =E2=
=80=94 these mimic how Qt works by always working in (possibly fractional) =
pixel units. Our code uses scintilla through these methods; we=E2=80=99re b=
eginning to migrate to using the float variants; the integer methods work w=
ith the expected limitations.

The second patch uses full repaints on macOS because I intermittently see a=
 one pixel of selection color when I select and deselect lines (though I ca=
n trigger it pretty easily). I=E2=80=99ve only tested on macOS so far so th=
is may be a problem on win32 as well; I=E2=80=99m using a QT_SCALE_FACTOR=
=3D8.5 to test. The patch also fixes the initial tiny text problem and a sc=
roll by lines bug.

I=E2=80=99m going to see if I can figure out where the one pixel line comes=
 from.

Thanks,

John

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nterest/2726E62A-72FA-4022-9F68-C9CAAB4620FE%40wingware.com.

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	filename=QtScale-pixels-method-gen.patch
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diff -r 7d5e2d6cf92c -r b191544ae99b include/Scintilla.iface
--- a/include/Scintilla.iface	Tue Jun 16 11:23:34 2026 +0100
+++ b/include/Scintilla.iface	Tue Jun 16 11:38:17 2026 +0100
@@ -210,11 +210,11 @@
 set void SetTabDrawMode=2699(TabDrawMode tabDrawMode,)
 
 # Find the position from a point within the window.
-fun position PositionFromPoint=2022(int x, int y)
+fun position PositionFromPoint=2022(pixels x, pixels y)
 
 # Find the position from a point within the window but return
 # INVALID_POSITION if not close to text.
-fun position PositionFromPointClose=2023(int x, int y)
+fun position PositionFromPointClose=2023(pixels x, pixels y)
 
 # Set caret to start of a line and ensure it is visible.
 fun void GotoLine=2024(line line,)
@@ -272,10 +272,10 @@
 get int GetTabWidth=2121(,)
 
 # Set the minimum visual width of a tab.
-set void SetTabMinimumWidth=2724(int pixels,)
+set void SetTabMinimumWidth=2724(pixels pixels,)
 
 # Get the minimum visual width of a tab.
-get int GetTabMinimumWidth=2725(,)
+get pixels GetTabMinimumWidth=2725(,)
 
 # Clear explicit tabstops on a line.
 fun void ClearTabStops=2675(line line,)
@@ -439,7 +439,7 @@
 set void MarkerSetBackSelectedTranslucent=2296(int markerNumber, colouralpha back)
 
 # Set the width of strokes used in .01 pixels so 50  = 1/2 pixel width.
-set void MarkerSetStrokeWidth=2297(int markerNumber, int hundredths)
+set void MarkerSetStrokeWidth=2297(int markerNumber, pixels hundredths)
 
 # Enable/disable highlight for current folding block (smallest one that contains the caret)
 fun void MarkerEnableHighlight=2293(bool enabled,)
@@ -498,10 +498,10 @@
 get MarginType GetMarginTypeN=2241(int margin,)
 
 # Set the width of a margin to a width expressed in pixels.
-set void SetMarginWidthN=2242(int margin, int pixelWidth)
+set void SetMarginWidthN=2242(int margin, pixels pixelWidth)
 
 # Retrieve the width of a margin in pixels.
-get int GetMarginWidthN=2243(int margin,)
+get pixels GetMarginWidthN=2243(int margin,)
 
 # Set a mask that determines which markers are displayed in a margin.
 set void SetMarginMaskN=2244(int margin, int mask)
@@ -1009,10 +1009,10 @@
 get IndicFlag IndicGetFlags=2685(int indicator,)
 
 # Set the stroke width of an indicator in hundredths of a pixel.
-set void IndicSetStrokeWidth=2751(int indicator, int hundredths)
+set void IndicSetStrokeWidth=2751(int indicator, pixels hundredths)
 
 # Retrieve the stroke width of an indicator.
-get int IndicGetStrokeWidth=2752(int indicator,)
+get pixels IndicGetStrokeWidth=2752(int indicator,)
 
 # Set the foreground colour of all whitespace and whether to use this setting.
 fun void SetWhitespaceFore=2084(bool useSetting, colour fore)
@@ -1021,10 +1021,10 @@
 fun void SetWhitespaceBack=2085(bool useSetting, colour back)
 
 # Set the size of the dots used to mark space characters.
-set void SetWhitespaceSize=2086(int size,)
+set void SetWhitespaceSize=2086(pixels size,)
 
 # Get the size of the dots used to mark space characters.
-get int GetWhitespaceSize=2087(,)
+get pixels GetWhitespaceSize=2087(,)
 
 # Used to hold extra styling information for each line.
 set void SetLineState=2092(line line, int state)
@@ -1049,11 +1049,11 @@
 
 # Retrieve the caret line frame width.
 # Width = 0 means this option is disabled.
-get int GetCaretLineFrame=2704(,)
+get pixels GetCaretLineFrame=2704(,)
 
 # Display the caret line framed.
 # Set width != 0 to enable this option and width = 0 to disable it.
-set void SetCaretLineFrame=2705(int width,)
+set void SetCaretLineFrame=2705(pixels width,)
 
 # Set a style to be changeable or not (read only).
 # Experimental feature, currently buggy.
@@ -1373,16 +1373,16 @@
 set void AllocateLines=2089(line lines,)
 
 # Sets the size in pixels of the left margin.
-set void SetMarginLeft=2155(, int pixelWidth)
+set void SetMarginLeft=2155(, pixels pixelWidth)
 
 # Returns the size in pixels of the left margin.
-get int GetMarginLeft=2156(,)
+get pixels GetMarginLeft=2156(,)
 
 # Sets the size in pixels of the right margin.
-set void SetMarginRight=2157(, int pixelWidth)
+set void SetMarginRight=2157(, pixels pixelWidth)
 
 # Returns the size in pixels of the right margin.
-get int GetMarginRight=2158(,)
+get pixels GetMarginRight=2158(,)
 
 # Is the document different from when it was last saved?
 get bool GetModify=2159(,)
@@ -1410,10 +1410,10 @@
 get bool GetSelectionHidden=2088(,)
 
 # Retrieve the x value of the point in the window where a position is displayed.
-fun int PointXFromPosition=2164(, position pos)
+fun pixels PointXFromPosition=2164(, position pos)
 
 # Retrieve the y value of the point in the window where a position is displayed.
-fun int PointYFromPosition=2165(, position pos)
+fun pixels PointYFromPosition=2165(, position pos)
 
 # Retrieve the line containing a position.
 fun line LineFromPosition=2166(position pos,)
@@ -1496,10 +1496,10 @@
 get bool GetOvertype=2187(,)
 
 # Set the width of the insert mode caret.
-set void SetCaretWidth=2188(int pixelWidth,)
+set void SetCaretWidth=2188(pixels pixelWidth,)
 
 # Returns the width of the insert mode caret.
-get int GetCaretWidth=2189(,)
+get pixels GetCaretWidth=2189(,)
 
 # Sets the position that starts the target which is used for updating the
 # document without affecting the scroll position.
@@ -1595,7 +1595,7 @@
 set void CallTipSetForeHlt=2207(colour fore,)
 
 # Enable use of STYLE_CALLTIP and set call tip tab size in pixels.
-set void CallTipUseStyle=2212(int tabSize,)
+set void CallTipUseStyle=2212(pixels tabSize,)
 
 # Set position of calltip, above or below text.
 set void CallTipSetPosition=2213(bool above,)
@@ -1813,10 +1813,10 @@
 get WrapVisualLocation GetWrapVisualFlagsLocation=2463(,)
 
 # Set the start indent for wrapped lines.
-set void SetWrapStartIndent=2464(int indent,)
+set void SetWrapStartIndent=2464(pixels indent,)
 
 # Retrive the start indent for wrapped lines.
-get int GetWrapStartIndent=2465(,)
+get pixels GetWrapStartIndent=2465(,)
 
 enu WrapIndentMode=SC_WRAPINDENT_
 val SC_WRAPINDENT_FIXED=0
@@ -1845,10 +1845,10 @@
 get LineCache GetLayoutCache=2273(,)
 
 # Sets the document width assumed for scrolling.
-set void SetScrollWidth=2274(int pixelWidth,)
+set void SetScrollWidth=2274(pixels pixelWidth,)
 
 # Retrieve the document width assumed for scrolling.
-get int GetScrollWidth=2275(,)
+get pixels GetScrollWidth=2275(,)
 
 # Sets whether the maximum width line displayed is used to set scroll width.
 set void SetScrollWidthTracking=2516(bool tracking,)
@@ -1859,7 +1859,7 @@
 # Measure the pixel width of some text in a particular style.
 # NUL terminated text argument.
 # Does not handle tab or control characters.
-fun int TextWidth=2276(int style, string text)
+fun pixels TextWidth=2276(int style, string text)
 
 # Sets the scroll range so that maximum scroll position has
 # the last line at the bottom of the view (default).
@@ -1871,7 +1871,7 @@
 get bool GetEndAtLastLine=2278(,)
 
 # Retrieve the height of a particular line of text in pixels.
-fun int TextHeight=2279(line line,)
+fun pixels TextHeight=2279(line line,)
 
 # Show or hide the vertical scroll bar.
 set void SetVScrollBar=2280(bool visible,)
@@ -1933,7 +1933,7 @@
 
 # Split the lines in the target into lines that are less wide than pixelWidth
 # where possible.
-fun void LinesSplit=2289(int pixelWidth,)
+fun void LinesSplit=2289(pixels pixelWidth,)
 
 # Set one of the colours used as a chequerboard pattern in the fold margin
 fun void SetFoldMarginColour=2290(bool useSetting, colour back)
@@ -2351,10 +2351,10 @@
 fun void DelLineRight=2396(,)
 
 # Set the xOffset (ie, horizontal scroll position).
-set void SetXOffset=2397(int xOffset,)
+set void SetXOffset=2397(pixels xOffset,)
 
 # Get the xOffset (ie, horizontal scroll position).
-get int GetXOffset=2398(,)
+get pixels GetXOffset=2398(,)
 
 # Set the last x chosen value to be the caret x position.
 fun void ChooseCaretX=2399(,)
@@ -2388,7 +2388,7 @@
 
 # Set the way the caret is kept visible when going sideways.
 # The exclusion zone is given in pixels.
-fun void SetXCaretPolicy=2402(CaretPolicy caretPolicy, int caretSlop)
+fun void SetXCaretPolicy=2402(CaretPolicy caretPolicy, pixels caretSlop)
 
 # Set the way the line the caret is on is kept visible.
 # The exclusion zone is given in lines.
@@ -2756,16 +2756,16 @@
 get Alpha IndicGetOutlineAlpha=2559(int indicator,)
 
 # Set extra ascent for each line
-set void SetExtraAscent=2525(int extraAscent,)
+set void SetExtraAscent=2525(pixels extraAscent,)
 
 # Get extra ascent for each line
-get int GetExtraAscent=2526(,)
+get pixels GetExtraAscent=2526(,)
 
 # Set extra descent for each line
-set void SetExtraDescent=2527(int extraDescent,)
+set void SetExtraDescent=2527(pixels extraDescent,)
 
 # Get extra descent for each line
-get int GetExtraDescent=2528(,)
+get pixels GetExtraDescent=2528(,)
 
 # Which symbol was defined for markerNumber with MarkerDefine
 fun MarkerSymbol MarkerSymbolDefined=2529(int markerNumber,)
@@ -2865,11 +2865,11 @@
 fun void AddUndoAction=2560(int token, UndoFlags flags)
 
 # Find the position of a character from a point within the window.
-fun position CharPositionFromPoint=2561(int x, int y)
+fun position CharPositionFromPoint=2561(pixels x, pixels y)
 
 # Find the position of a character from a point within the window.
 # Return INVALID_POSITION if not close to text.
-fun position CharPositionFromPointClose=2562(int x, int y)
+fun position CharPositionFromPointClose=2562(pixels x, pixels y)
 
 # Set whether switching to rectangular mode while selecting with the mouse is allowed.
 set void SetMouseSelectionRectangularSwitch=2668(bool mouseSelectionRectangularSwitch,)
@@ -2917,7 +2917,7 @@
 fun void AddSelection=2573(position caret, position anchor)
 
 # Find the selection index for a point. -1 when not at a selection.
-fun int SelectionFromPoint=2474(int x, int y)
+fun int SelectionFromPoint=2474(pixels x, pixels y)
 
 # Drop one selection
 fun void DropSelectionN=2671(int selection,)
diff -r 7d5e2d6cf92c -r b191544ae99b qt/ScintillaEdit/WidgetGen.py
--- a/qt/ScintillaEdit/WidgetGen.py	Tue Jun 16 11:23:34 2026 +0100
+++ b/qt/ScintillaEdit/WidgetGen.py	Tue Jun 16 11:38:17 2026 +0100
@@ -44,6 +44,7 @@
 	"colour": "int",
 	"colouralpha": "int",
 	"keymod": "int",
+	"pixels": "int",
 	"string": "const char *",
 	"stringresult": "const char *",
 	"cells": "const char *",
@@ -58,7 +59,7 @@
 		return s
 
 understoodTypes = ["", "void", "int", "bool", "position", "line", "pointer",
-	"colour", "colouralpha", "keymod", "string", "stringresult", "cells"]
+	"colour", "colouralpha", "keymod", "pixels", "string", "stringresult", "cells"]
 
 def understoodType(t):
 	return t in understoodTypes or Face.IsEnumeration(t)
@@ -76,22 +77,102 @@
 		understandAllTypes = False
 	return understandAllTypes
 
-def arguments(v, stringResult, options):
+def isPixel(t):
+	return t == "pixels"
+
+def hasPixels(v):
+	return isPixel(v["ReturnType"]) or isPixel(v["Param1Type"]) or isPixel(v["Param2Type"])
+
+def floatSuffix(options):
+	return "F" if options["qtStyle"] else "_f"
+
+def argCppType(t, floatVariant):
+	if floatVariant and isPixel(t):
+		return "double"
+	a = cppAlias(t)
+	if a == "int":
+		a = "sptr_t"
+	return a
+
+def returnCppType(v, stringResult, floatVariant):
+	if stringResult:
+		return "QByteArray"
+	if floatVariant and isPixel(v["ReturnType"]):
+		return "double"
+	r = cppAlias(v["ReturnType"])
+	if r == "int":
+		r = "sptr_t"
+	return r
+
+def arguments(v, stringResult, options, floatVariant):
 	ret = ""
-	p1Type = cppAlias(v["Param1Type"])
-	if p1Type == "int":
-		p1Type = "sptr_t"
+	p1Type = argCppType(v["Param1Type"], floatVariant)
 	if p1Type:
 		ret = ret + p1Type + " " + normalisedName(v["Param1Name"], options)
-	p2Type = cppAlias(v["Param2Type"])
-	if p2Type == "int":
-		p2Type = "sptr_t"
+	p2Type = argCppType(v["Param2Type"], floatVariant)
 	if p2Type and not stringResult:
 		if p1Type:
 			ret = ret + ", "
 		ret = ret + p2Type + " " + normalisedName(v["Param2Name"], options)
 	return ret
 
+def sendArg(ptype, pname, options):
+	# Expression passed to send() for one parameter slot.
+	if not cppAlias(ptype):
+		return "0"
+	name = normalisedName(pname, options) if pname else "0"
+	if isPixel(ptype):
+		# Caller passes logical pixels; the engine expects device pixels.
+		return "qRound64(" + name + " * sciScale)"
+	if "*" in cppAlias(ptype):
+		return "(sptr_t)" + name
+	return name
+
+def declaration(name, v, feat, options, floatVariant):
+	constDeclarator = " const" if feat == "get" else ""
+	stringResult = v["Param2Type"] == "stringresult"
+	returnType = returnCppType(v, stringResult, floatVariant)
+	suffix = floatSuffix(options) if floatVariant else ""
+	return ("\t" + returnType + " " + normalisedName(name, options, feat) + suffix + "(" +
+		arguments(v, stringResult, options, floatVariant) +
+		")" + constDeclarator + ";")
+
+def definition(name, v, feat, options, floatVariant):
+	out = []
+	constDeclarator = " const" if feat == "get" else ""
+	featureDefineName = "SCI_" + name.upper()
+	stringResult = v["Param2Type"] == "stringresult"
+	returnType = returnCppType(v, stringResult, floatVariant)
+	suffix = floatSuffix(options) if floatVariant else ""
+	out.append(returnType + " ScintillaEdit::" + normalisedName(name, options, feat) + suffix + "(" +
+		arguments(v, stringResult, options, floatVariant) +
+		")" + constDeclarator + " {")
+	if hasPixels(v):
+		# Scale factor the engine is using: the "ScintillaScale" viewport
+		# property (set by ScintillaQt::SetScaleProperty) is the device-pixel
+		# ratio under SCALE_TECHNIQUE_PIXEL_ALIGNED and 0.0 otherwise.
+		out.append("    const double sciScaleProp = viewport()->property(\"ScintillaScale\").toDouble();")
+		out.append("    const double sciScale = sciScaleProp ? sciScaleProp : 1.0;")
+	returnStatement = "return " if returnType != "void" else ""
+	if stringResult:
+		out.append("    " + returnStatement + "TextReturner(" + featureDefineName + ", " +
+			sendArg(v["Param1Type"], v["Param1Name"], options) + ");")
+	else:
+		call = ("send(" + featureDefineName + ", " +
+			sendArg(v["Param1Type"], v["Param1Name"], options) + ", " +
+			sendArg(v["Param2Type"], v["Param2Name"], options) + ")")
+		if isPixel(v["ReturnType"]):
+			# Engine returns device pixels; hand back logical pixels.
+			if floatVariant:
+				out.append("    " + returnStatement + call + " / sciScale;")
+			else:
+				out.append("    " + returnStatement + "qRound64(" + call + " / sciScale);")
+		else:
+			out.append("    " + returnStatement + call + ";")
+	out.append("}")
+	out.append("")
+	return out
+
 def printHFile(f, options):
 	out = []
 	for name in f.order:
@@ -100,16 +181,9 @@
 			feat = v["FeatureType"]
 			if feat in ["fun", "get", "set"]:
 				if checkTypes(name, v):
-					constDeclarator = " const" if feat == "get" else ""
-					returnType = cppAlias(v["ReturnType"])
-					if returnType == "int":
-						returnType = "sptr_t"
-					stringResult = v["Param2Type"] == "stringresult"
-					if stringResult:
-						returnType = "QByteArray"
-					out.append("\t" + returnType + " " + normalisedName(name, options, feat) + "(" +
-						arguments(v, stringResult, options)+
-						")" + constDeclarator + ";")
+					out.append(declaration(name, v, feat, options, False))
+					if hasPixels(v):
+						out.append(declaration(name, v, feat, options, True))
 	return out
 
 def methodNames(f, options):
@@ -129,49 +203,9 @@
 			feat = v["FeatureType"]
 			if feat in ["fun", "get", "set"]:
 				if checkTypes(name, v):
-					constDeclarator = " const" if feat == "get" else ""
-					featureDefineName = "SCI_" + name.upper()
-					returnType = cppAlias(v["ReturnType"])
-					if returnType == "int":
-						returnType = "sptr_t"
-					stringResult = v["Param2Type"] == "stringresult"
-					if stringResult:
-						returnType = "QByteArray"
-					returnStatement = ""
-					if returnType != "void":
-						returnStatement = "return "
-					out.append(returnType + " ScintillaEdit::" + normalisedName(name, options, feat) + "(" +
-						arguments(v, stringResult, options) +
-						")" + constDeclarator + " {")
-					returns = ""
-					if stringResult:
-						returns += "    " + returnStatement + "TextReturner(" + featureDefineName + ", "
-						if "*" in cppAlias(v["Param1Type"]):
-							returns += "(sptr_t)"
-						if v["Param1Name"]:
-							returns += normalisedName(v["Param1Name"], options)
-						else:
-							returns += "0"
-						returns += ");"
-					else:
-						returns += "    " + returnStatement + "send(" + featureDefineName + ", "
-						if "*" in cppAlias(v["Param1Type"]):
-							returns += "(sptr_t)"
-						if v["Param1Name"]:
-							returns += normalisedName(v["Param1Name"], options)
-						else:
-							returns += "0"
-						returns += ", "
-						if "*" in cppAlias(v["Param2Type"]):
-							returns += "(sptr_t)"
-						if v["Param2Name"]:
-							returns += normalisedName(v["Param2Name"], options)
-						else:
-							returns += "0"
-						returns += ");"
-					out.append(returns)
-					out.append("}")
-					out.append("")
+					out += definition(name, v, feat, options, False)
+					if hasPixels(v):
+						out += definition(name, v, feat, options, True)
 	return out
 
 def gtkNames():

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diff -r 7d5e2d6cf92c -r daa799cb6b38 qt/ScintillaEditBase/PlatQt.cpp
--- a/qt/ScintillaEditBase/PlatQt.cpp	Tue Jun 16 11:23:34 2026 +0100
+++ b/qt/ScintillaEditBase/PlatQt.cpp	Tue Jun 16 11:38:17 2026 +0100
@@ -935,15 +935,17 @@
 	if (wid) {
 		const qreal scale = ScaleOfWindow(wid);
 		if (scale) {
-#if !defined(Q_OS_WIN) && !defined(Q_OS_APPLE)
-			// Using X11 or Wayland, likely Linux but may be a BSD or similar
+#if !defined(Q_OS_WIN)
+			// Using X11, Wayland, or macOS.
 			if (scale != 1.0 && scale != 2.0) {
 				// Fractional scaling leaves repaint debris, so redraw completely
 				window(wid)->update();
 				return;
 			}
 #endif
-			rc = rc / scale;
+			// Use QRectF::toAlignedRect to get int rect that contains float rect
+			window(wid)->update(QRectFFromPRect(rc / scale).toAlignedRect());
+			return;
 		}
 		window(wid)->update(QRectFromPRect(rc));
 	}
diff -r 7d5e2d6cf92c -r daa799cb6b38 qt/ScintillaEditBase/ScintillaQt.cpp
--- a/qt/ScintillaEditBase/ScintillaQt.cpp	Tue Jun 16 11:23:34 2026 +0100
+++ b/qt/ScintillaEditBase/ScintillaQt.cpp	Tue Jun 16 11:38:17 2026 +0100
@@ -277,6 +277,11 @@
 void ScintillaQt::ScrollText(Sci::Line linesToMove)
 {
 	int dy = vs.lineHeight * (linesToMove);
+	if (IsPixelAlignedScale()) {
+		// lineHeight is in device pixels, viewport()->scroll() needs logical pixels
+		const qreal scale = window(wMain.GetID())->devicePixelRatioF();
+		dy = qRound(dy / scale);
+	}
 	scrollArea->viewport()->scroll(0, dy);
 }
 
@@ -780,6 +785,8 @@
 
 		case Message::SetScaleTechnique:
 			scaleTechnique = static_cast<ScaleTechnique>(wParam);
+			// Scale property needs to be set before InvalidateStyleRedraw()
+			SetScaleProperty();
 			InvalidateStyleRedraw();
 			break;
 

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> On Jun 16, 2026, at 12:56=E2=80=AFAM, Neil Hodgson <scintilladotorg@gmail=
.com> wrote:
>=20
> An updated version is available that fixes problems with scrolling and
> position+size of calltips and autocompletion.
>=20
> A ScaleTechnique property was added with values
> SCALE_TECHNIQUE_DEFAULT=3D0, SCALE_TECHNIQUE_PIXEL_ALIGNED=3D1 controlled
> with a SCI_SETSCALETECHNIQUE API.
>=20
> The ScaleTechnique property may get additional enumeration values or
> modifying bit flags with future refinements. This feature is marked
> provisional so may change.
>=20
> While the calltips and autocompletion lists are positioned under the
> caret, they do not always flip above the caret when there is no room
> below. This is because scaling is not consistently taken into account
> when checking the bottom of the screen or window.
>=20
> Autocompletion lists were made slightly wider as text could be
> truncated with ... in some cases. This is from converting coordinates
> that are scaled by a fraction to integers and there may be other
> instances with similar issues.
>=20
> The patch changes the location of the output shared libraries to be in
> scintilla/bin as they were often in
> scintilla/qt/ScintillaEditBase/bin. Newer versions of qmake (or Qt
> Creator) seemed to use a different base or current directory when
> building and this caused problems for downstream projects like Haven
> that were coded to previous behaviour.
>=20
> Haven was updated as https://www.scintilla.org/HavenScale4.zip to
> match the changes in the patch.
>=20
> Patch attached.
>=20
> This may be committed to the main repository for the next release, so
> anyone who thinks it may cause problems or want changes should speak
> up now.
>=20
> Neil
>=20
> --=20
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> <QtScaleH.patch>

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