fix potential infinite loop in rs2_project_color_pixel_to_depth_pixel

[wsmlby]

The current implementation of next_pixel_in_line and is_pixel_in_line means a loop may fall into an infinite loop if start/end's Y difference is an integer.

example:

    float start[2] = {0, 0};
    float end[2] = {30, 2};
    float cur[2] = {0, 0};
    for(; is_pixel_in_line(cur, start, end); next_pixel_in_line(cur, start, end)) {
        printf("%f, %f\n", cur[0], cur[1]);
    }

This PR fixed it.

[sysrsbuild]

Can one of the admins verify this patch?

[wsmlby]

Another option here is to make is_pixel_in_line exclusive on the end side.

[Copilot]

Pull Request Overview

This PR fixes a potential infinite loop in rs2_project_color_pixel_to_depth_pixel that occurs due to floating point precision issues when iterating along a line between two pixels. The fix adds an explicit check to break the loop when the current pixel position exactly matches the end pixel.

• Adds a safety check to prevent infinite loops caused by floating point precision issues
• Includes explanatory comment documenting the specific scenario that causes the problem

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[Copilot]

Using exact floating point equality comparison can be unreliable due to precision issues. Consider using a small epsilon tolerance for the comparison instead, such as fabs(p[0] - end_pixel[0]) < epsilon && fabs(p[1] - end_pixel[1]) < epsilon.

[OhadMeir]

Close and reopen to trigger internal CI