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The source code for Tk is managed by fossil. Tk developers coordinate all
changes to the Tk source code at
> [Tk Source Code](https://core.tcl-lang.org/tk/)
Release Tk 9.0.1 arises from the check-in with tag `core-9-0-1`.
The changes since Tk 9.0.0 include...
Release Tk 9.0.0 arises from the check-in with tag `core-9-0-0`.
Highlighted differences between Tk 9.0 and Tk 8.6 are summarized below,
with focus on changes important to programmers using the Tk library and
writing Tcl scripts containing Tk commands.
## Many improvements to use of platform features and conventions.
- Built-in widgets and themes are scaling-aware.
- Improved support of two-finger gestures, where available
- The `tk windowingsystem` "aqua" needs macOS 10.10 or later
## New commands and options
- `tk sysnotify` — Access to the OS notifications system
- `tk systray` — Access to the OS tray facility
- `tk print` — Access to the OS printing facility
## Widget options
- New `ttk::progressbar` option: **-text**
- `$frame ... -backgroundimage $img -tile $bool`
- `$menu id`, `$menu add|insert ... ?$id? ...`
- `$image get ... -withalpha ...`
- All indices now accept the forms **end**, **end-int**, **int+|-int**
## Improved widget appearance
- `ttk::notebook` with nondefault tab positions
## Images
- Partial SVG support
- Read/write access to photo image metadata
## Known bugs
- [Use of Tcl_Obj vs char * in Widget storage](https://core.tcl-lang.org/tk/tktview/f91aa2)
- [Tilde file syntax not available on 9.0 but used by "~/.Xdefaults"](https://core.tcl-lang.org/tk/tktview/fcfddc)
- [many PIXEL options don't keep their configured value](https://core.tcl-lang.org/tk/tktview/29ba53)
- [Canvas widget handles pixel objects incorrectly in Tk 9.0](https://core.tcl-lang.org/tk/tktview/610a73)
- [Inconsistent reporting of child geometry changes to grid container](https://core.tcl-lang.org/tk/tktview/beaa8e)
- [Inconsistency in whether widgets allow negative borderwidths](https://core.tcl-lang.org/tk/tktview/5f739d)
- [Enter key works differently in Windows and Linux](https://core.tcl-lang.org/tk/tktview/b3a1b9)
- [slow widget creation if default font is not used](https://core.tcl-lang.org/tk/tktview/8da7af)
- [The wm manage command does not work on current macOS versions](https://core.tcl-lang.org/tk/tktview/8a6012)
- [Slow processing irregular transparencies](https://core.tcl-lang.org/tk/tktview/919066)
- [text's cursor width on 0th column](https://core.tcl-lang.org/tk/tktview/47fbfc)
- [text widget breaks graphemes with combining diacritical marks](https://core.tcl-lang.org/tk/tktview/442208)
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