27bc4c4ce5
Say you have a document of two blocks of text.
When you select a block of text in the document and then replace this
with a new empty block (by pressing enter) and then subsequently
undo this action, the following three steps are performed as a
chain of undo commands:
1. Remove the empty block at the beginning of the document
2. Insert a new empty block at the beginning of the document
3. Insert the text back into the first block
Since a block is removed and inserted in the same go, both blocks
require a relayout, since the accumulated change spans both blocks.
However, in QPlainTextDocumentLayout we would only look at the max
of either removed chars or added chars. This would match the text
length of the first block at this point, so we would only relayout
that block. However, since we are also removing characters, the
actual accumulated change to the document is larger. We should
relayout any block touched by the sum of the added and removed
character counts.
Missing this, the paint event would later query
block.layout()->lineForTextPosition(0) which would give an invalid
line despite the fact that the block.length() > 0. This caused
a crash in the paint event when the full width selection was
turned on.
Note that the logic here was only recently updated to include the
removed characters at all in the logic, by the SHA1:
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| auto | ||
| baselineserver | ||
| benchmarks | ||
| global | ||
| manual | ||
| shared | ||
| README | ||
| tests.pro | ||
This directory contains autotests and benchmarks based on Qt Test. In order
to run the autotests reliably, you need to configure a desktop to match the
test environment that these tests are written for.
Linux X11:
* The user must be logged in to an active desktop; you can't run the
autotests without a valid DISPLAY that allows X11 connections.
* The tests are run against a KDE3 or KDE4 desktop.
* Window manager uses "click to focus", and not "focus follows mouse". Many
tests move the mouse cursor around and expect this to not affect focus
and activation.
* Disable "click to activate", i.e., when a window is opened, the window
manager should automatically activate it (give it input focus) and not
wait for the user to click the window.