2002-02-17  Michael Natterer  <mitch@gimp.org>

	Fixed #34633 (wheel mouse zooming leaves straigth-line helpline on
	image) and maybe some other stuff caused by the misbehaviour
	described below:

	* app/tools/tools-types.h
	* app/tools/tool_manager.c (tool_manager_control_active):

	Removed the "PAUSED" ToolState.

	The possible state transitions were INACTIVE <-> ACTIVE <-> PAUSED,
	where the ACTIVE <-> PAUSED transition was done only in the
	tool_manager, causing the tools's control() never to be called
	when the tool was INACTIVE.

	The GimpPaintTool however wants to draw on the display when it's
	INACTIVE, and of course wants to be suspended/resumed correctly
	while fiddling with display repainting/scaling/...

	The PAUSED state was also redundant information, since
	(tool->paused_count > 0) is the same information (only more
	correct and independent of tool activity).

	* app/display/gimpdisplayshell-scale.[ch]: suspend/resume the
	active tool around _all_ changes to the display's "scale" and
	"offset" fields.  Added new function
	gimp_display_shell_scale_by_values() which does that and is called
	from all places which need to change these values.

	* app/tools/gimpmagnifytool.c: changed accordingly.

	Unrelated stuff:

	* app/paint/gimpairbrush.c: added a #warning FIXME.

	* app/tools/gimpdrawtool.c: made a warning more verbose.

	* app/tools/gimppainttool.c: put one more drawable offset
	calculation in { .. }, will make a utility function out of it...