Bug 548140

Summary:

[win32][StyledText] Hieroglyph causes preceding spaces to change size

Product:

[Eclipse Project] Platform

Reporter:

Alexandr Miloslavskiy <alexandr.miloslavskiy>

Component:

SWT

Assignee:

Platform-SWT-Inbox <platform-swt-inbox>

Status:

NEW ---

QA Contact:

Severity:

normal

Priority:

CC:

alexandr.miloslavskiy, ts-swt

Version:

4.12

Target Milestone:

---

Hardware:

OS:

Windows 10

See Also:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=536562

Whiteboard:

Attachments:

Description	Flags
Repro snippet	none

Description Alexandr Miloslavskiy

2019-06-11 06:03:04 EDT

I have debugged it a bit and found out this:
1) 'ScriptItemize' WINAPI allocates spaces preceding the hieroglyphs into the same "run".
2) 'TextLayout.shape' fails, because hieroglyphs are not found in selected font.
3) Fallback font 'Microsoft Sans Serif' is selected.
4) Preceding spaces are using this font, therefore the size is different.

A possible solution:
When "run" is composed of "good" and "bad" characters, split them into separate "runs", so that "good" characters can continue to use non-fallback font.

Comment 1 Alexandr Miloslavskiy

2019-06-11 06:05:39 EDT

Created attachment 278888 [details]
Repro snippet