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I recently use the Task Switcher dialog to install a third-party
switcher. However, after installing the switcher and activating it, I
received the error:
window switcher installation is broken: resources are missing
so I uninstalled that switcher, but the issue persisted, even for
system-installed switchers -- all except the compiz ones (Cover Switch
and Flip Switch), ie I gather it remained for all the ones relying on
Qt.
killing kwin_x11 and restarting in a console, I saw the error:
```
file:///usr/share/kwin/tabbox/informative/contents/ui/main.qml:134: TypeError:
Cannot call method 'longestCaption' of null
```
so I edited that file, changing the contents of calculateMaxRowWidth to
be:
```
118 function calculateMaxRowWidth() {
119 var width = 0;
120 var model = tabBox.model;
121 var caption = tabBox.model ?
tabBox.model.longestCaption() : ""; // safely get thelongest caption
122 var textElement = Qt.createQmlObject(
123 'import QtQuick 2.0;'
124 + 'Text {\n'
125 + ' text: "' +
dialogMainItem.itemCaption(caption, true) + '"\n'
126 + ' font.bold: true\n'
127 + ' visible: false\n'
128 + '}',
129 compactListView, "calculateMaxRowWidth");
130 width = Math.max(textElement.width, width);
131 textElement.destroy();
132 return width + 16 + 2 * dialogMainItem.textMargin +
hoverItem.margins.right + hoverItem.margins.left
133 }
```
and now things are all working properly again. I would suggest this (or
something similar) to safeguard against this kind of problem -- there
didn't seem to be anything I could do from user-space to sort this out,
as I had already uninstalled the only switcher I had installed when the
error started happening.
** Affects: kwin (Ubuntu)
Importance: Undecided
Status: New
--
kwin-addons: after installing any third-party task-switcher, all non-compiz
switchers error
https://bugs.launchpad.net/bugs/1835530
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