Make sidebar_first and sidebar_second optional regions

@akoepke - currently sidebar regions are required by Fusion, but I see that those regions are not in use by the fusion mobile theme. Let me find out more information about this...

@stephthegeek - sidebar regions are part of the grid calculations. I could make those regions optional and make any calculated template variables related to sidebar or group widths = 0... what do you think? there are also theme settings that assume those regions are present.

@aquariumtap: I'm not sure how the technical implementation would work but yeah this is an open question for fusion_mobile. I think it needs to become optional one way or another.

okay. I agree. It's come up in other issues as well.

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Subscribing, as I am running into this issue as well.

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In my opinion, Fusion isn't the best choice for a theme without sidebars. But if you want to tweak an existing theme, for example, you need to remove all mention of sidebar_first and sidebar_second in the bottom part of the theme's .info file, where "grid adjusted regions", "grid adjusted groups" and "grid adjusted groups fluid" are defined.

If you don't have any sidebars, you can probably just replace this:

; --------------------------------------------------------------------------------
; Some regions receive grid unit assignments automatically based on the size
; of adjacent regions.  For example, the content region will be adjusted to 
; be the total grid width less the width of both sidebars.  The assignments
; below are used by the grid calculator to do that simple math.
; --------------------------------------------------------------------------------
settings[grid_adjusted_regions][preface_bottom][] = sidebar_first
settings[grid_adjusted_regions][help][] = sidebar_first
settings[grid_adjusted_regions][help][] = sidebar_second
settings[grid_adjusted_regions][content][] = sidebar_first
settings[grid_adjusted_regions][content][] = sidebar_second
settings[grid_adjusted_regions][node_top][] = sidebar_first
settings[grid_adjusted_regions][node_top][] = sidebar_second
settings[grid_adjusted_regions][node_bottom][] = sidebar_first
settings[grid_adjusted_regions][node_bottom][] = sidebar_second
settings[grid_adjusted_regions][postscript_top][] = sidebar_first

; --------------------------------------------------------------------------------
; A group contains one or more regions.  An adjusted group will be assigned 
; grid units based on the width of other regions.  The layout is defined below to 
; allow for that calculation.
; --------------------------------------------------------------------------------
settings[grid_adjusted_groups][main_group][] = sidebar_first
settings[grid_adjusted_groups][content_group][] = sidebar_first
settings[grid_adjusted_groups][content_group][] = sidebar_second

; --------------------------------------------------------------------------------
; Fluid layouts are based on percentages.  A width percentage is always relative
; to its containing element.  In order for a grid assignment to represent the same
; rendered width across different levels in the layout heirarchy, it's necessary
; to make adjustments to percentages.  To do this, Fusion needs to understand
; how regions relate with one another.
; --------------------------------------------------------------------------------
; Regions outside a parent group to subtractto get correct parent width
settings[grid_adjusted_regions_fluid][sidebar_second][] = sidebar_first
settings[grid_adjusted_regions_fluid][content][] = sidebar_first
settings[grid_adjusted_regions_fluid][content][] = sidebar_second
; Regions inside a parent group to subtract toget remaining width
settings[grid_adjusted_groups_fluid][content_group][] = sidebar_second

With this:

settings[grid_adjusted_regions] = 
settings[grid_adjusted_groups] =
settings[grid_adjusted_regions_fluid]

I haven't tested, but that should work.

Hey guys,

This issue is still alive, using fresh install Fusion + Fusion Mobile, can't fix it, cause fusiom_mobile.info does not contain regions listed in error, so there is nothing to delete.

Fusion Mobile is no longer necessary with the 7.x-2.x version.