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When using the Nimbus look and feel, mapping Ctrl+PAGE_UP and Ctrl+PAGE_DOWN to specific actions in the Options Keymap dialog don't trigger those actions when using the editor. I mapped the two key combinations to "Previous Tab" and "Next Tab" respectively. The mapping appeared to work, but when working with the editor, the new mappings didn't work. I did discover that Ctrl+PAGE_UP and Ctrl+PAGE_DOWN do function as horizontal scroll left and horizontal scroll right, respectively. This obviously only occurs when the horizontal scroll bar is active. When I changed from Nimbus to the default look and feel, the problem went away and the key mappings worked as expected. Test Platform: Ubuntu Linux 8.10 amd64 Java 6u12 b03 (amd64) and Java 6 u11 (amd64)
Not sure what's wrong.
If you want some hint from someone who doesn't know what he's taking about: You might look for some inspiration at the "start page" (saubrecht). It handles these shortcuts properly - if you press Ctrl+PG_UP/DOWN while being on the start page, it works, but for other editor tab it doesn't. (With Nimbus l&f, of course).
I can confirm this same behaviour running on Windows, so the problem is not Linux specific. This is on Windows XP Professional SP3 running Netbeans 6.5 on JDK 6u11. All the latest Netbeans updates are applied. The key bindings work as expected with the default L&F but when using Nimbus L&F then CTRL+PGUP & CTRL+PGDN only work when the start page tab is focused. When an editor tab has focus they trigger horizontal scrolling as described. I have not come across any other problematic key bindings.
Java 6u16 (amd64) netbeans-trunk-nightly-200911030222-ml-cpp-linux.sh - The question and is not solved
Looks like Nimbus binds those key strokes to something. I am marking the issue as wontfix.