Inkscape Export PNG Image dialog does not remember previous Custom settings.

[Alvin Penner]

- running Windows XP, Inkscape 0.92pre1 (Nov 4 2016)
- open Export PNG dialog
- Choose the Custom tab
- set the values of x0, y0, Width, Height
- set the values of Image Width, Height
- successfully save the png image

- restart Inkscape and reload a file
- open PNG Export dialog to get the attached result, where all settings are forgotten and the object size is zero.

- reproduced on Inkscape 0.47

[Alvin Penner (apenner)]

Note that the preferences file appears to have settings related to this, for (x,y,w,h).
However these settings do not appear to have been used.
The settings are:

    <group
       id="export"
       default=""
       append_extension="1"
       path=""
       panel_size="1"
       panel_ratio="100"
       panel_mode="1"
       panel_wrap="0"
       panel_border="0"
       x="854"
       y="0"
       w="365"
       h="371"
       visible="0"
       state="1"
       placement="1">
      <group
         id="exportarea"
         value="custom" />
      <group
         id="defaultxdpi"
         value="96" />
      <group
         id="hideexceptselected"
         value="0" />
    </group>

[jazzynico (jazzynico)]

Reproduced on Windows XP (32-bit) with lp:inkscape/0.92.x rev. 15205.
Reproduced on Xubuntu 16.04 with lp:inkscape rev. 15260.

[Alvin Penner (apenner)]

transferred to GitLab as:
https://gitlab.com/inkscape/inkscape/issues/78