sw lok: disable field shadings

There are two problems with it:

First, the field shading is rendered behind bullet portions depending on
the cursor position (if the cursor is before the bullet, then we
render it; but not if the cursor is after the bullet), and tiled
rendering assumes that the render result is independent from the cursor
position.

Second, field shading is always painted directly (not going via
invalidation), so it's possible to end up with one tile showing field
shadings and another not, which is inconsistent. And even if it would be
there consistently, that would mean a lot of unnecessary invalidations.

The alternative would be to disable this from online.git's
loolconfig.xcu, but the item's path would end with something like
"ColorScheme['LibreOfficeDev']/WriterFieldShadings", which means it's
not easy to do this in a way that's independent from the product name.

Change-Id: I23c62acc3c15966cfba98fcee99cc96854ba4394
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/110263
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

1 files changed, 4 insertions, 0 deletions

diff --git a/sw/source/uibase/uno/unotxdoc.cxx b/sw/source/uibase/uno/unotxdoc.cxx
index 1a0615b0f09f..2575fe176f1c 100644
--- a/sw/source/uibase/uno/unotxdoc.cxx
+++ b/sw/source/uibase/uno/unotxdoc.cxx
@@ -3458,6 +3458,10 @@ void SwXTextDocument::initializeForTiledRendering(const css::uno::Sequence<css::
     // Tiled rendering defaults.
     SwViewOption aViewOption(*pViewShell->GetViewOptions());
     aViewOption.SetHardBlank(false);
+
+    // Disable field shadings: the result would depend on the cursor position.
+    SwViewOption::SetAppearanceFlag(ViewOptFlags::FieldShadings, false);
+
     for (const beans::PropertyValue& rValue : rArguments)
     {
         if (rValue.Name == ".uno:HideWhitespace" && rValue.Value.has<bool>())