User-Agent: Build Identifier: Version 184.108.40.206 (20090812) After slight adjustments in the Thunderbird configuration (about:config --> mousewheel.withcontrolkey.action --> value: 3), the zoom level in all message windows can be changed by keeping down the CTRL-key and scrolling with the mousewheel. Then TB behaves exactly the same way as Firefox does (zooms in/out). In TB the zoom level will be set back automatically to default (100 %) after exiting a message window or manually after executing the shortcut [Ctrl]+ . This works fine in "NORMAL" message windows e. g. while reading a new mail. Within the COMPOSE WINDOW, zooming via Ctrl + Mousewheel works as well. - BUT there's no function behind the shortcut [Ctrl]+ , so it doesn’t set the zoom level back to default (100 %). - AND exiting the compose window will also not set back the zoom level to default (100 %). So you will never be able to go back to the default zoom level, because you will never know when you reach 100 % again via Ctrl + Mousewheel, since the Zoom Level isn't displayed anywhere. --> Therefore [Ctrl] +  in TB should also be enabled for setting back the zoom level to default (100 %) in COMPOSE WINDOWs like in other "normal" mail windows (and in FF). --> Moreover leaving the compose window should also automatically set the zoom level back to default (100 %) like in other mail windows. Reproducible: Always
(In reply to rosaroter-panther from comment #0) > --> Therefore [Ctrl] +  in TB should also be enabled for setting back the > zoom level to default (100 %) in COMPOSE WINDOWs like in other "normal" mail > windows (and in FF). rosaroter-panther, contrary to my expectation, Ctrl++ and Ctrl+- does NOT change the zoom in compose windows, it actually increases/decreases the font size of selected text (Format > Size > Larger/Smaller). Given that, I think the Ctrl+0 part of this bug is currently invalid, because Ctrl+0 should reset the font size then, not the zoom (but we currently don't have Ctrl+0 for resetting font size, which needs a new bug if there isn't one yet). > --> Moreover leaving the compose window should also automatically set the > zoom level back to default (100 %) like in other mail windows. That part sounds reasonable and should be confirmed. Perhaps we can morph this bug and exclude the Ctrl+0 part for composition. Notwithstanding, I'm wondering if Ctrl++/-/0 is a good shortcut for changing actual font size instead of zoom (in composition), which is inconsistent with the msg reader. Perhaps we should have Ctrl+> and Ctrl+< for the font size (if that's available), to free up Ctrl++/-/0 for the zoom. But that needs more thought, checks, and a new bug.
(In reply to rosaroter-panther from comment #0) > So you will never be able to go back to the default zoom level, because you > will never know when you reach 100 % again via Ctrl + Mousewheel, since the > Zoom Level isn't displayed anywhere. After landing of bug 250415 in TB10, this is a bug, not an RFE. User has no way of returning to default zoom level of 100% except guessing.
Technically, we probably want to change back to the default zoom of 100% when we *open* a new or existing composition. Current behaviour is unpredictable and confusing: STR 1) compose msg on current trunk (12), subject: draft1 2) Ctrl+mousewheel to zoom to 300% 3) close & save draft1 4) reopen draft1, check zoom, close 5) Click Write Button for another new msg (draft2), check zoom 6) reopen draft1, check zoom Current behaviour: 4) after reopening, existing draft has previous zoom value of 300 (this bug, no exact way to reset to 100%), so we pretend to keep the zoom level; however, only until a new draft is created before re-opening an old one. 5) Write new msg always opens with 100% (ok) 6) After 5), any subsequently opened saved drafts will open with 100% (or whatever zoom value was last chosen in another draft). I don't see a pattern here, anybody? Perhaps for the time being, always opening draft messages (new or existing) at 100% zoom level would be the best solution. Technically, reset the zoom value to 100% before creating or re-opening drafts.
This has been fixed by bug 738194, after which we'll have an ux-consistent experience of zoom shortcuts (starting from TB18): Ctrl++ zoom in (everywhere in TB, including composition) Ctrl+- zoom out Ctrl+0 reset zoom (now also works in composition - that's the fix for this bug) Ctrl+< to decrease font size (which needs holding Shift on many keyboards, but we also accept non-shifted shortcut, hence Ctrl+, will work on all keyboards) Ctrl+> to increase font size (and we also accept Ctrl+.) The font size shortcuts are also consistent with popular Office applications. If required, we can deal with the strange and somewhat unpredictable behaviour of *initial zoom* in composition windows elsewhere (as tentatively observed in comment 3; probably related to our old problem of re-using windows). The biggest problem is solved with providing Ctrl+0 for resetting zoom to 100%.