Tab labels not rendered properly when using Xft rendereing

[jan vrany]

When using Xft text rendering, tab labels are not always rendered.

Steps to reproduce:

• Open fresh new system browser.
• Make many tabs so they cannot fit into window so scroll buttons (arrows) appear

Tab labels for few first tabs are rendered properly whereas labels for last tabs are not rendered at all.

Spotted & reported by Stefan Vogel.

[jan vrany]

Fixed in XftFontDescription 1.20

[jan vrany]

Also not rendered properly when tabs are either on the left or on the right (contrary to top or bottom). This is exposed by UIPainter's widget gallery window, for instance.

This problem manifests itself by displaying black rectangle instead of text and message like following on stdout:

XWorkstation [error]: x-error caught maj=139 (0x8b) "?", min=4 (0x4), resource=2a
XWorkstation [error]: x-error message is [8] 'BadMatch (invalid parameter attributes)'
XWorkstation [error]: x-error caught maj=139 (0x8b) "?", min=23 (0x17), resource=2e002f5
XWorkstation [error]: x-error message is [143] 'RenderBadPicture (invalid Picture parameter)'
VM [info] (16-05-26 12:03:08): pending: [errorIRQ(16) ]
VM [info] (16-05-26 12:03:08): interrupt on unlimited stack - ignored.
DeviceWorkstation [info]: Display error: RenderBadPicture (invalid Picture parameter) in XRequest.139 - nil
DeviceWorkstation [info]: interrupting: an ioWait Process (event dispatcher (:0), id=4)
DeviceWorkstation [error]: Display error: RenderBadPicture (invalid Picture parameter) in XRequest.139

[jan vrany]

Notify Claus once this issue is fixed and closed.

[jan vrany]

Fixed by:

• 6e51fc8b207f/stx.libview: XFT: Drop support for shared drawables.
• 8efc17a5de76/stx.libview: XFT: Correctly answer true to isAntialiasedFont
• 97e40cfd96bb/stx.libview: Issue #25: Added tests to check XFT rendering into pixmaps
• 1387e5aedc55/stx.libview: Issue #25: Sort-of-fixed `GraphicsContext?>>displayString:x:y:angle:opaque: with antialiased fonts