mswin.vim remaps CTRL-C and CTRL-Insert as follows: vnoremap <C-C> "+y vnoremap <C-Insert> "+y Also remapping are other CTRL-key combinations such as: map <C-V> "+gP noremap <C-A> gggH<C-O>G ... There is a Gnome option "Show position of pointer when the Control key is pressed" available at: System (Gnome panel menu) -> Preferences -> Hardware -> Mouse If this Gnome option of disabled, then CTRL-C, CTRL-INSERT, CTRL-V, CTRL-A all work fine. If this Gnome option is enabled, then CTRL-C does not work (vim leaves visual mode, but the previously selected data is not copied to the clipboard). However, all the other keys mentioned above work just fine. I ran the xev application and looked at the events received for CTRL-A and CTRL-C with the Gnome option on. I couldn't see any difference (except the keycode obviously) Hence, since I believe vim is getting the same events for both keys, it's a vim bug the CTRL-C doesn't work, not a Gnome bug. Note that when this Gnome option is enabled, vim/xev do receive a bunch of extra focus/grab events relative to when the Gnome option is disabled. Perhaps this is what's causing the issue?
FYI, with the Gnome option turned on: * pressing CTRL-SHIFT-C makes vim to the copy OK... * pressing some key between the CTRL and C makes it work, e.g. press and hold CTRL, press and release SHIFT (or L), press C, release everything Very odd.
The vim IRC channel was helpful. Here's part of an IRC log for posterity: [22:35] <\amethyst> swarren: I see the same behaviour: it looks like the ctrl-c still gets through to vim, but doesn't get mapped [22:36] <\amethyst> swarren: it does seem to work if you press ctrl-shift-c [22:37] <swarren> yup, C-S-C works for me too [22:39] <\amethyst> swarren: also if you press another key between control and c [22:39] <\amethyst> swarren: like <hold ctrl><press and release shift><press c><release ctrl> [22:39] <swarren> Or even CTRL L C ! [22:39] <\amethyst> yeah [22:40] <\amethyst> when I press ctrl and the Gnome thing activates, the cursor changes to the inactive cursor [22:40] <\amethyst> but the window still appears to have the focus [22:40] <\amethyst> so maybe vim is being confused by having keyboard focus stolen temporarily [22:41] <swarren> Yeah, I think that's related to the grab/ungrab events I see in xev [22:41] <swarren> and there was a pair of focus out/in events too I think [22:42] <\amethyst> vim doesn't get a keypress event for the ctrl [22:42] <\amethyst> it gets one for the C, with the correct state bits set [22:44] <\amethyst> maybe that is confusing it, but... when you press shift in the middle you get keypress/release events for the shift but still no events for the control [22:45] <swarren> hmm. That sequence of events make sense, although vim's interpretation of them doesn't. Especially since a direct press of e.g. CTRL-A/CTRL-V works without anything intermediate. [22:47] <\amethyst> swarren: ctrl-c is handled specially in the input code, so that might have something to do with it [22:48] <swarren> Yeah, that'd make sense [22:50] <\amethyst> swarren: there's a variable called ctrl_c_interrupts; maybe it's not being set to FALSE when it should [22:51] <\amethyst> swarren: (it's supposed to be set to false whenever the GUI is waiting and ctrl-c is mapped)
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For my reference, near the end of gui_gtk_x11.c:key_press_event(), changing from: if (len == 1 && ((string[0] == Ctrl_C && ctrl_c_interrupts) || (string[0] == intr_char && intr_char != Ctrl_C))) to: if (len == 1 && ((string[0] == Ctrl_C && ctrl_c_interrupts && !mapped_ctrl_c) || (string[0] == intr_char && intr_char != Ctrl_C))) appears to solve this, and CTRL-C still works when entering a command after pressing ":" in normal mode. (The difference between the Gnome option and not is that pressing/release the CTRL key generates focus in/out events via gui.c:gui_focus_change(). I'm not totally sure why this affects the ctrl_C_interrupts variable though.)