RFR: 8260528: Clean glass-gtk sizing and positioning code [v39]

[Thiago Milczarek Sayao]

> This cleans size and positioning code, reducing special cases, code complexity and size.
> 
> Changes:
> 
> - cached extents: 28, 1, 1, 1 are old defaults - modern gnome uses different sizes. It does not assume any size because it varies - it does cache because it's unlikely to vary on the same system - but if it does occur, it will only waste a resize event.
> - window geometry, min/max size are centralized in `update_window_constraints`;
> - Frame extents (the window decoration size used for "total window size"):
>     - frame extents are received in `process_property_notify`;
>     - removed quirks in java code;
>     - When received, call `set_bounds` again to adjust the size (to account decorations later received);
> - Removed `activate_window` because it's the same as focusing the window. `gtk_window_present` will deiconify and focus it.
> - `ensure_window_size` was a quirk - removed;
> - `requested_bounds` removed - not used anymore;
> - `window_configure` incorporated in `set_bounds` with `gtk_window_move` and `gtk_window_resize`;
> - `process_net_wm_property` is a work-around for Unity only (added a check if Unity - but it can probably be removed at some point)
> - `restack` split in `to_front()` and `to_back()` to conform to managed code;
> - Set `gtk_window_set_focus_on_map` to FALSE because if TRUE the Window Manager changes the window ordering in the "focus stealing" mechanism - this makes possible to remove the quirk on `request_focus()`;
> - Note:  `geometry_get_*` and `geometry_set_*` moved location but unchanged.

Thiago Milczarek Sayao has updated the pull request incrementally with one additional commit since the last revision:

  Fix InitialSizeTest

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/915/files
  - new: https://git.openjdk.org/jfx/pull/915/files/bda05316..caff49cc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=915&range=38
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=915&range=37-38

  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/915.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/915/head:pull/915

PR: https://git.openjdk.org/jfx/pull/915